openair (version 1.0)

openColours: openair colours

Description

Pre-defined openair colours and definition of user-defined colours

Usage

openColours(scheme = "default", n = 100)

Arguments

scheme

The pre-defined schemes are "increment", "default", "brewer1", "heat", "jet", "hue", "greyscale", or a vector of R colour names e.g. c("green", "blue"). It is also possible to supply colour schemes from the RColorBrewer package. This package

n

number of colours required.

Value

• Returns colour values - see examples below.

Details

This in primarily an internal openair function to make it easy for users to select particular colour schemes, or define their own range of colours of a user-defined length.

Each of the pre-defined schemes have merits and their use will depend on a particular situation. For showing incrementing concentrations e.g. high concentrations emphasised, then "default", "heat", "jet" and "increment" are very useful. See also the description of RColorBrewer schemes for the option scheme.

To colour-code categorical-type problems e.g. colours for different pollutants, "hue" and "brewer1" are useful.

When publishing in black and white, "greyscale" is often convenient. With most openair functions, as well as generating a greyscale colour gradient, it also resets strip background and other coloured text and lines to greyscale values.

Failing that, the user can define their own schemes based on R colour names. To see the full list of names, type colors() into R.

References

http://colorbrewer.org

Examples

# to return 5 colours from the "jet" scheme:
cols <- openColours("jet", 5)
cols

# to interpolate between named colours e.g. 10 colours from yellow to
#  green to red:
cols <- openColours(c("yellow", "green", "red"), 10)
cols